Patent
Arcing fault detection module
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TLDR
In this paper, an arcing fault detection module for detecting arcing faults in an electrical current distribution circuit comprises a filter circuit (9) and an autocorrelation circuit (10).Abstract:
An arcing fault detection module (4) for detecting arcing faults in an electrical current distribution circuit (8) comprises a filter circuit (9) and an autocorrelation circuit (10). The filter circuit (9) is electrically connected to the distribution circuit (8) and samples current with the distribution circuit. The filter circuit (9) includes a band pass filter (12) to filter out fundamental and high frequency components from the sampled current, and a comparator (13) to convert the sampled current to a digital signal. The autocorrelation circuit (10) receives the digital signal from the filter circuit (9). The autocorrelation circuit (10) includes a plurality of shift registers (15-18) for storing the digital signal for a predetermined sample period, and a plurality of EXCLUSIVE-OR gates (35-37,41, 43, 44) and OR gates (38, 39) to detect odd and even harmonic signals. An integrator-counter (47) electrically connects to certain EXCLUSIVE-OR and OR gates, and provides an arc indicative signal when the absolute value of the even and odd harmonic signals is equal to a predetermined number.read more
Citations
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References
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Electronic circuit breaker with protection against sputtering arc faults and ground faults
TL;DR: In this article, a circuit breaker bandwidth limits a sensed rate of change of current in the neutral conductor of a protected electrical system and fullwave rectifies the bandwidth limited di/dt signal for comparison with an instantaneous trip reference signal.
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Self testing circuit breaker ground fault and sputtering arc trip unit
TL;DR: In this paper, ground fault trip units for circuit breakers are tested by a passive test circuit which includes a test conductor passing through the current transformer sensing coil(s), and a test switch which selectively connects the test conductor in a loop which simulates a neutral-to-ground fault.
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High impedance fault detection apparatus and method
TL;DR: In this article, the presence of a high impedance arcing fault on an electrical circuit, particularly a high voltage power line, is detected by monitoring the high frequency components of the alternating current.
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TL;DR: In this paper, the voltage across the bimetal is used to sense load currents and the signal is converted to a bandwidth limited di/dt signal, which is used as an input to an arcing fault detector.
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Arc detection using current variation
TL;DR: In this paper, the AC line current is sampled with a harmonic notch filter at a plurality of n phases Θ 1 through Θ n during each of m cycles of the AC source, where n is the phase and m is the cycle.